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It is characterized by highly branched pale tan gills and by a reticulate pattern of thin whitish-tan lines on the pale tan body, and small orange tubercles, there are some larger whitish tubercles in median region of the notum.
Pretty similar are:
Marionia arborescens which differs by a greenish-brown body, and is densely covered with tubercles, each darker outlined, and
Marionia sp. 08 which is also densely covered with tubercles, each darker outlined.
Marionia sp. 10 which might be a colour variant, it lacks the whitish median tubercles.
How to cite:
Köhler, E. (2016), published 31 January 2016, Marionia sp. 15 Genus: Vayssière, 1877
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Marionia_sp_15.htm